all of a sudden, my Tivo HD can't get past the "starting up - welcome" screen. The next thing I see is a solid green/gray screen. Only one light is present on the front panel: the far left-hand light. Network connection LED's are glowing on the back panel, and the hard drive is the stock unit - no upgrades have been done. It's a "lifetime" box, that's about four-years old I imagine. Since it's a lifetime box, it would be nice to save it. Any suggestions?